This is easily one of my top two BB apps that I use multiple times daily. You will not find a BB app that compares. How are you wanting to organize your notes? IdeaMatrix lets you organize your notes in many different ways.

Although not a notes organizer per se, you can also take a look at one of the various password managers for the BB. I use DataVault. You can store quite a lot of information, setup your own templates and organize by various means. Also comes with a desktop companion to sync with.